861646030100 has 72 divisors (see below), whose sum is σ = 1883779305408. Its totient is φ = 342080352000.

The previous prime is 861646030057. The next prime is 861646030127. The reversal of 861646030100 is 1030646168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17899664 + ... + 17947736.

It is an arithmetic number, because the mean of its divisors is an integer number (26163601464).

Almost surely, 2^861646030100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861646030100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941889652704).

861646030100 is an abundant number, since it is smaller than the sum of its proper divisors (1022133275308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861646030100 is a wasteful number, since it uses less digits than its factorization.

861646030100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49425 (or 49418 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

Adding to 861646030100 its reverse (1030646168), we get a palindrome (862676676268).

The spelling of 861646030100 in words is "eight hundred sixty-one billion, six hundred forty-six million, thirty thousand, one hundred".